JPS6011295B2 - Clinker prevention water wall - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water wall for preventing clinker in waste incinerators, fluidized bed furnaces, and the like.

In recent garbage incinerators, the amount of heat generated tends to be extremely high due to the high proportion of plastics and the like contained in the garbage and the co-incineration of crushed bulky garbage. As a result, as shown in FIGS. 1 and 2, the combustion stoker 1
Clinkers A and B often adhere to the side wall 2 of the drying stoker 3 and the connecting wall 4 of the drying stoker 3 and the combustion stoker 1, and when the adhering clinker grows sequentially and becomes a large lump, , the progress of the waste on the stoker is obstructed, resulting in a situation where the operation of the furnace has to be stopped.
Therefore, in the case of ordinary coal-fired boilers, the water cooling wall is lowered to the level of the stoker and used as a water cooling wall to prevent clinker, thereby preventing the occurrence of chrysocarbons on the stoker side. are doing.

However, in garbage incinerators, etc., when the side wall water cooling wall pipe 5 is lowered to the stoker level, the corrosion of the water wall pipe in this area becomes extremely severe, so the water cooling wall pipe 5 is lowered to the stoker level. The principle in designing waste incinerators is not to lower the position of the lower pipe header 6 of the wall pipe 5 below the level of x-x.

The reason why corrosion becomes particularly severe at the stoker level is because the stoker side region within the incinerator becomes a so-called reduction zone. In other words, water wall pipes are protected from corrosion by an oxide film formed on their surface, but the strong reducing action of carbon in the flame destroys the oxide film, causing it to lose its corrosion resistance. This is because relatively large amounts of chlorine gas and the like are generated. In addition, in Fig. 1, 7 is the upper header of the water wall pipe 5, 8 is the boiler body, 9 is the steam drum, 1
4 is a garbage input hopper, and 15 is an after-combustion stoker.
The present invention is applicable to garbage incinerators, sludge incinerators, industrial waste incinerators, and other facilities other than stoker incinerators, where corrosion of water pipes at the stoker level is particularly severe and water cooling wall pipes cannot be lowered to this level. The purpose of this project is to solve the above-mentioned problems in fluidized bed reactors, etc., which are prone to clinker problems.It is possible to cool the heavily corroded inner surface of the reactor wall, such as the stoker side, to an appropriate temperature without causing corrosion to the water pipes. The object of the present invention is to provide a water-cooled wall for clinker prevention that can effectively prevent the generation of clinker.

The basic configuration of the present invention is to attach a plurality of finned water pipes 10, 10 in parallel inside the furnace wall, and to fix the castable heat-resistant material 12 between each fin, thereby forming water-cooled wall pipes and the like. This system cools the side of the furnace wall at the stoker level to an appropriate temperature while preventing corrosion of the fins attached to the fins, thereby preventing clinker formation and overcooling caused by the water-cooled wall tubes.

Hereinafter, the details will be explained based on an embodiment of the present invention shown in FIGS. 3 to 8.

FIG. 3 is a partial front view showing the basic structure of the water sill wall according to the present invention, and FIG. 4 is a cross-sectional view as viewed from FIG. 3.

In FIGS. 3 and 4, 10 is a finned water pipe, and 11 is a fin welded to the outer peripheral surface of the water pipe at right angles to the rattan core and at appropriate intervals in the longitudinal direction. The finned water pipes are arranged in parallel with adjacent fins 11, 11 substantially in contact with each other, and are fixed to the inside of the furnace wall C by an appropriate method. 12 is a castable heat-resistant material filled between each fin of the water pipe 10;
2 prevents the combustion gas in the furnace from directly touching the side surfaces of the water tube 10 and the fins 11.

That is, only the outer end surface 11a of the fin 11 is exposed to the inside of the furnace. In addition, in this example,
Although a clay caster pull heat resistant material 12 using chamotte is used for the rib cage, a castable heat resistant material 12 made of chromium or alumina may also be used. FIG. 5 is a partial front view showing a state in which the water lining wall according to the present invention is used around the side wall portion 2 of the combustion stoker 1 and the connecting portion wall surface 4 of the combustion stoker 1 and drying stoker 3, and FIG. FIG. 6 is a mouth-to-mouth sectional view of FIG. 5;

Each water tube 10 is connected in a coil shape, and when the furnace is not a boiler, it is used as a water heater by circulating water, and when it is equipped with a boiler and is a forced circulation type, the boiler heat transfer surface used as part of. FIG. 7 is a partial front view showing a case where it is configured as a water-cooled wall of a boiler or the like, and FIG. 8 is a sectional view of FIG.

A finned water pipe 10 is used in the lower part of the water pipe constituting the water cooling wall, that is, in an area where corrosion is severe on the stoker side, and a castable heat-resistant material 12 is filled and fixed between the fins. In addition, the upper part of the water sill wall is a bare tube 13, which is the same as before, and is incorporated into the boiler's circulation system. As described above, in the present invention, the water cooling wall is constructed by using the finned water pipe 10 and filling and fixing the castable heat-resistant material 12 between the fins 11, so that it can be used in extremely corroded areas such as the stoker level of a furnace. Even though
Combustion gas does not directly touch the water pipe or fin sides, significantly improving corrosion resistance.

In addition, because the castable heat-resistant material 12 is filled and fixed between the fins, the heat transfer characteristics are slightly lower than in the case of bare tubes, but the effectiveness of heat transfer when using the outer end surfaces 11a of the fins, etc. is considerable. It is possible to cool the furnace wall to a temperature that prevents clinker formation without overcooling the furnace wall surface. That is, it is possible to reliably prevent clinker from occurring without adversely affecting combustion characteristics. Furthermore, in boilers that use pulverized coal with a large amount of fixed carbon as fuel, and where there is a risk of overcooling occurring with the water-cooled walls of bare water pipes, overcooling can be prevented by using the water-cooled walls according to the present invention. This is extremely convenient. Moreover, in the present invention, each fin 11, 11... and the castable heat-resistant material 12, 1 driven between each fin.
Since the heat-resistant materials 12, 12, and 2... are extremely strongly integrated, even if the combustible material moving on the stoker comes into direct contact with the outer surface of the water pipe C, the heat-resistant materials 12, 12, . ...
There is no possibility that the ... will loosen or fall off. As mentioned above, the present invention can be widely applied not only to garbage incinerators but also to sludge incinerators, industrial waste incinerators, fluidized bed furnaces other than stoker furnaces, pulverized coal boilers with a large amount of fixed carbon, etc. It has particularly excellent effects in terms of preventing clinker formation and supercooling.

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional front view of the previous garbage incinerator, and the second
The figure is a YY cross-sectional view of FIG. 1. FIG. 3 is a partial front view of the water cooling wall according to the present invention, and FIG. 4 is a sectional view taken along line A--A in FIG. 3. FIG. 5 is a partial front view of a waste incinerator using a water-cooled wall according to the present invention, and FIG. 6 is a sectional view of FIG. Figure 7 shows
FIG. 8 is a partial front view of a boiler water wall using the water cooling wall according to the present invention, and FIG. 8 is a cross-sectional view of FIG. A
- B... Clinker, C... Furnace wall, 10... Fined water pipe, 11... Fin, 11a... Fin outer end surface, 12... Castable heat-resistant material. Figure 1 Figure 2 Figure 3 Old Man Mu Figure 6 Figure 7 Figure 5 Figure 8

Claims (1)

[Claims] 1 A plurality of water pipes 1 with fins are provided inside the furnace wall C, and fins 11 are provided on the outer peripheral surface of the water pipe at right angles to the axis thereof.
0, 10... are arranged and fixed in parallel, and castable heat-resistant material 12 is driven into the gap of each fin 11 of the finned water pipe 10 and fixed, so that only the tip surface of each fin 11 is exposed to the inside of the furnace. A water-cooled wall for preventing clinker, characterized by being configured as follows.